// Blind search for C-RNTI
static int find_dl_dci_type_crnti(srslte_ue_dl_t* q,
srslte_dl_sf_cfg_t* sf,
srslte_ue_dl_cfg_t* cfg,
uint16_t rnti,
srslte_dci_msg_t dci_msg[SRSLTE_MAX_DCI_MSG])
{
int ret = SRSLTE_SUCCESS;
dci_blind_search_t search_space;
dci_blind_search_t* current_ss = &search_space;
uint32_t sf_idx = sf->tti % 10;
uint32_t cfi = sf->cfi;
srslte_dci_cfg_t* dci_cfg = &cfg->dci_cfg;
// Search UE-specific search space
if (q->pregen_rnti == rnti) {
current_ss = &q->current_ss_ue[MI_IDX(sf_idx)][cfi - 1][sf_idx];
} else {
// If locations are not pre-generated, generate them now
current_ss->nof_locations = srslte_pdcch_ue_locations(&q->pdcch, sf, current_ss->loc, MAX_CANDIDATES_UE, rnti);
}
if (cfg->cfg.tm > SRSLTE_TM8) {
ERROR("Searching DL CRNTI: Invalid TM=%d\n", cfg->cfg.tm + 1);
}
for (int f = 0; f < 2; f++) {
srslte_dci_format_t format = ue_dci_formats[cfg->cfg.tm][f];
INFO("Searching DL C-RNTI %s in %d ue locations\n", srslte_dci_format_string(format), current_ss->nof_locations);
current_ss->format = format;
if ((ret = dci_blind_search(q, sf, rnti, current_ss, dci_cfg, dci_msg))) {
return ret;
}
}
// Search Format 1A in the Common SS also
if (q->pregen_rnti == rnti) {
current_ss = &q->current_ss_common[MI_IDX(sf_idx)][cfi - 1];
} else {
// If locations are not pre-generated, generate them now
current_ss->nof_locations = srslte_pdcch_common_locations(&q->pdcch, current_ss->loc, MAX_CANDIDATES_COM, cfi);
}
// Search for RNTI only if there is room for the common search space
if (current_ss->nof_locations > 0) {
current_ss->format = SRSLTE_DCI_FORMAT1A;
INFO("Searching DL C-RNTI in %d ue locations, format 1A\n", current_ss->nof_locations);
return dci_blind_search(q, sf, rnti, current_ss, dci_cfg, dci_msg);
}
return SRSLTE_SUCCESS;
}
// Blind search for SI/P/RA-RNTI
static int find_dl_dci_type_siprarnti(srslte_ue_dl_t* q,
srslte_dl_sf_cfg_t* sf,
srslte_ue_dl_cfg_t* cfg,
uint16_t rnti,
srslte_dci_msg_t dci_msg[SRSLTE_MAX_DCI_MSG])
{
int ret = 0;
srslte_dci_cfg_t* dci_cfg = &cfg->dci_cfg;
// Configure and run DCI blind search
dci_blind_search_t search_space;
search_space.nof_locations = srslte_pdcch_common_locations(&q->pdcch, search_space.loc, MAX_CANDIDATES_COM, sf->cfi);
INFO("Searching SI/P/RA-RNTI in %d common locations, %d formats, tti=%d, cfi=%d, rnti=0x%x\n",
search_space.nof_locations,
nof_common_formats,
sf->tti,
sf->cfi,
rnti);
// Search for RNTI only if there is room for the common search space
if (search_space.nof_locations > 0) {
for (uint32_t f = 0; f < nof_common_formats; f++) {
search_space.format = common_formats[f];
if ((ret = dci_blind_search(q, sf, rnti, &search_space, dci_cfg, dci_msg))) {
return ret;
}
}
}
return SRSLTE_SUCCESS;
}
int srslte_ue_dl_find_ul_dci(srslte_ue_dl_t *q, uint32_t cfi, uint32_t sf_idx, uint16_t rnti, srslte_dci_msg_t *dci_msg)
{
if (rnti && cfi > 0 && cfi < 4) {
/* Do not search if an UL DCI is already pending */
if (q->pending_ul_dci_rnti == rnti) {
q->pending_ul_dci_rnti = 0;
memcpy(dci_msg, &q->pending_ul_dci_msg, sizeof(srslte_dci_msg_t));
return 1;
}
// Configure and run DCI blind search
dci_blind_search_t search_space;
search_space.nof_locations = 0;
dci_blind_search_t *current_ss = &search_space;
if (q->current_rnti == rnti) {
current_ss = &q->current_ss_ue[cfi-1][sf_idx];
} else {
// If locations are not pre-generated, generate them now
current_ss->nof_locations = srslte_pdcch_ue_locations(&q->pdcch, current_ss->loc, MAX_CANDIDATES_UE, sf_idx, cfi, rnti);
}
current_ss->format = SRSLTE_DCI_FORMAT0;
INFO("Searching UL C-RNTI in %d ue locations\n", search_space.nof_locations);
return dci_blind_search(q, current_ss, rnti, cfi, dci_msg);
} else {
return 0;
}
}
// Blind search for C-RNTI
static int find_dl_dci_type_crnti(srslte_ue_dl_t *q, uint32_t tm, uint32_t cfi,
uint32_t sf_idx, uint16_t rnti, srslte_dci_msg_t *dci_msg) {
int ret = SRSLTE_SUCCESS;
dci_blind_search_t search_space;
dci_blind_search_t *current_ss = &search_space;
if (cfi < 1 || cfi > 3) {
ERROR("CFI must be 1 ≤ cfi ≤ 3 (cfi=%d)", cfi);
return SRSLTE_ERROR;
}
// Search UE-specific search space
if (q->current_rnti == rnti) {
current_ss = &q->current_ss_ue[cfi-1][sf_idx];
} else {
// If locations are not pre-generated, generate them now
current_ss->nof_locations = srslte_pdcch_ue_locations(&q->pdcch, current_ss->loc, MAX_CANDIDATES_UE, sf_idx, cfi, rnti);
}
for (int f = 0; f < 2; f++) {
srslte_dci_format_t format = ue_dci_formats[tm][f];
INFO("Searching DL C-RNTI %s in %d ue locations\n", srslte_dci_format_string(format),
current_ss->nof_locations);
current_ss->format = format;
if ((ret = dci_blind_search(q, current_ss, rnti, cfi, dci_msg))) {
return ret;
}
}
// Search Format 1A in the Common SS also
if (q->current_rnti == rnti) {
current_ss = &q->current_ss_common[cfi-1];
} else {
// If locations are not pre-generated, generate them now
current_ss->nof_locations = srslte_pdcch_common_locations(&q->pdcch, current_ss->loc, MAX_CANDIDATES_COM, cfi);
}
// Search for RNTI only if there is room for the common search space
if (current_ss->nof_locations > 0) {
current_ss->format = SRSLTE_DCI_FORMAT1A;
INFO("Searching DL C-RNTI in %d ue locations, format 1A\n", current_ss->nof_locations);
return dci_blind_search(q, current_ss, rnti, cfi, dci_msg);
}
return SRSLTE_SUCCESS;
}
int srslte_ue_dl_find_ul_dci(srslte_ue_dl_t* q,
srslte_dl_sf_cfg_t* sf,
srslte_ue_dl_cfg_t* cfg,
uint16_t rnti,
srslte_dci_ul_t dci_ul[SRSLTE_MAX_DCI_MSG])
{
srslte_dci_msg_t dci_msg[SRSLTE_MAX_DCI_MSG];
uint32_t nof_msg = 0;
if (rnti) {
/* Do not search if an UL DCI is already pending */
if (q->pending_ul_dci_count) {
nof_msg = SRSLTE_MIN(SRSLTE_MAX_DCI_MSG, q->pending_ul_dci_count);
q->pending_ul_dci_count = 0;
memcpy(dci_msg, q->pending_ul_dci_msg, sizeof(srslte_dci_msg_t) * nof_msg);
} else {
uint32_t sf_idx = sf->tti % 10;
uint32_t cfi = sf->cfi;
set_mi_value(q, sf, cfg);
// Configure and run DCI blind search
dci_blind_search_t search_space;
search_space.nof_locations = 0;
dci_blind_search_t* current_ss = &search_space;
if (q->pregen_rnti == rnti) {
current_ss = &q->current_ss_ue[MI_IDX(sf_idx)][cfi - 1][sf_idx];
} else {
// If locations are not pre-generated, generate them now
current_ss->nof_locations = srslte_pdcch_ue_locations(&q->pdcch, sf, current_ss->loc, MAX_CANDIDATES_UE, rnti);
}
current_ss->format = SRSLTE_DCI_FORMAT0;
INFO("Searching UL C-RNTI in %d ue locations\n", search_space.nof_locations);
nof_msg = dci_blind_search(q, sf, rnti, current_ss, &cfg->dci_cfg, dci_msg);
}
// Unpack DCI messages
for (uint32_t i = 0; i < nof_msg; i++) {
if (srslte_dci_msg_unpack_pusch(&q->cell, sf, &cfg->dci_cfg, &dci_msg[i], &dci_ul[i])) {
ERROR("Unpacking UL DCI\n");
return SRSLTE_ERROR;
}
}
return nof_msg;
} else {
return 0;
}
}
// Blind search for SI/P/RA-RNTI
static int find_dl_dci_type_siprarnti(srslte_ue_dl_t *q, uint32_t cfi, uint16_t rnti, srslte_dci_msg_t *dci_msg)
{
int ret = 0;
// Configure and run DCI blind search
dci_blind_search_t search_space;
search_space.nof_locations = srslte_pdcch_common_locations(&q->pdcch, search_space.loc, MAX_CANDIDATES_COM, cfi);
INFO("Searching SI/P/RA-RNTI in %d common locations, %d formats\n", search_space.nof_locations, nof_common_formats);
// Search for RNTI only if there is room for the common search space
if (search_space.nof_locations > 0) {
for (int f=0;f<nof_common_formats;f++) {
search_space.format = common_formats[f];
if ((ret = dci_blind_search(q, &search_space, rnti, cfi, dci_msg))) {
return ret;
}
}
}
return SRSLTE_SUCCESS;
}
